CN101257992B - Laser processing machine tool with optical film slice for eliminating dispersion field - Google Patents
Laser processing machine tool with optical film slice for eliminating dispersion field Download PDFInfo
- Publication number
- CN101257992B CN101257992B CN2005800514697A CN200580051469A CN101257992B CN 101257992 B CN101257992 B CN 101257992B CN 2005800514697 A CN2005800514697 A CN 2005800514697A CN 200580051469 A CN200580051469 A CN 200580051469A CN 101257992 B CN101257992 B CN 101257992B
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- China
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- laser
- process machine
- laser process
- focus
- light beam
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
- B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
- B23K26/064—Shaping the laser beam, e.g. by masks or multi-focusing by means of optical elements, e.g. lenses, mirrors or prisms
- B23K26/066—Shaping the laser beam, e.g. by masks or multi-focusing by means of optical elements, e.g. lenses, mirrors or prisms by using masks
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- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Laser Beam Processing (AREA)
- Lasers (AREA)
Abstract
The invention relates to a laser machining machine (1) with a focussing optic system (6), which brings about an intermediate focussing of the laser beam (4) in a beam guide chamber (5) and with an optical shutter (9) arranged in the vicinity of the intermediate focussing (ZF) for beam shaping of the laser beam (4), the shutter opening diameter being according to the invention ca. 1.2 to ca. 2.5 times larger than the 99 % beam diameter of the laser beam (4) with intermediate focussing.
Description
Technical field
The present invention relates to a kind of laser process machine; Be particularly related to a kind of laser cutting lathe or the laser weld lathe; Comprise focus optics; Its focussed laser beam medially in the light beam guidance cavity, and comprise blooming piece (space diaphragm), this diaphragm arrangement in the intermediate focus zone to form laser beam.
Background technology
Such laser process machine is known, for example in patent document EP-A-1 180 409, mentions.
In with laser material being processed, as in laser cutting or welding, processing result depends on the power density and the beam quality of laser beam.The lasing beam diameter that must frequently accurately adjust processing stand is to reach the processing result of expectation.Except zlasing mode, laser beam also comprises diffraction structure (diffraction part), and it is compared with zlasing mode has bigger beam diameter and bigger far field diffusion.When laser beam is focused on the workpiece to be processed; These diffraction structures are present in the beam diameter outside of zlasing mode; And the heating of the workpiece outside processing stand that causes not expecting; This heating of not expecting has caused the decline of cutting or welding quality, for example coarse cutting edge, burn into scaling and little bandwidth of operation.In addition, at oxygen (O
2) in the laser cutting, maximum machinable material thickness obviously reduces.
Therefore, being used to form the blooming piece that light beam particularly filters diffraction structure is arranged on the known laser process machine.Can learn from initial patent document EP-A-1 180 409, eliminate the diffraction structure (fringing field) and the high-order zlasing mode of the laser beam that focuses in the centre by means of the blooming piece that is arranged in intermediate focus.In this case, to such an extent as to the diaphragm hole is chosen as the pressure that the very little pressure (overvoltage) that the blooming piece front exists in the light beam guidance cavity of purge of gas is higher than the blooming piece back significantly.Throttle point is served as simultaneously in the diaphragm hole therefore, is used for making flushing gas to flow through the light beam guidance cavity, reduces to flow through the amount of gas wherein thus.Yet the diaphragm hole is more little, and the loss of strength of zlasing mode is just high more.
Summary of the invention
In light of this situation, the objective of the invention is on the laser process machine of initial explanation type, not lose in zlasing mode under the situation of intensity, eliminate the interference of diffraction structure (fringing field).
This purpose of the present invention obtains for about 1.2 to about 2.5 times of 99% beam diameter of the laser beam that focuses on medially through making the diaphragm bore dia.The maximum intensity I (0) that this 99% beam diameter is defined as the laser beam center drops to 1% beam diameter.
At oxygen (O of the present invention
2) in the test of laser cutting lathe, caused the more significantly smooth and not scaling of cutting edge.Such fact is given the credit in the raising of this cutting quality, that is, be arranged in laser beam, cause the diffraction structure of the outside heating of processing stand to be eliminated at the processing stand place.
The focal length of focus optics selects " making progress " to be limited the biggest size of element of laser process machine, and " downwards " limited the heat in the kW lasers range (kW laser range) or the adjustable of mechanical stability and blooming piece.Diaphragm diameter is unpractiaca less than 1mm in many kW scope (multi-kW range).Intermediate focus preferably is positioned at the coupling output window of laser resonator and the deflecting mirror of light beam guidance cavity, particularly first deflecting mirror, between.
This blooming piece does not need to be positioned at accurately on the intermediate focus, and in the light beam contraction section of the laser beam that focuses in the middle of just being located at, but blooming piece can be set at from the maximum Rayleigh length place of intermediate focus.In the zone of light beam contraction section, Fresnel number is at or about zero, and therefore the space interval between zlasing mode and diffraction structure is maximum, like this diffraction structure here can be filtered and zlasing mode under loss minimum.
Can not cause the element of focus drifting preferably to be inserted in the middle of the beam path.Therefore, the focus optics of laser process machine and laser Machining head are non-transmission (non-transmitting) Optical devices or thermal lensing effect transmission (transmitting) Optical devices less than the ZnSe Optical devices.Transmission optics (like the ZnSe lens) changes their refractive index, and this refractive index has formed so-called thermal lens like this as the function according to the transmission laser power of the formation of the absorption of laser emission and thermograde.This lens effect causes focus along in the migration of the direction of propagation in intermediate focus zone, and causes locating to disturb the focus that depends on power to move at processing stand (bit is welded first-class).For the optimal function that reaches blooming piece with at the less focus drifting at processing stand place, should select to have transmission optics (like diamond coupling output window) or the non-transmission optics processing head of mirror Optical devices (as have) of lenslet effect.Use the ZnSe lens in these positions yes possible, but have aforesaid those shortcomings.
For example focus optics can be arranged on the outer mirror in the light beam guidance cavity, or triangle flatung shape, preferably is integrated in the coupling output window.
The light beam guidance cavity is preferably used gas bleed, and wherein the gas pressure that exists of blooming piece front and back is advantageously identical or much at one.
Further advantage of the present invention obtains from description and accompanying drawing.Likewise, more than explanation can the use separately with characteristic that be further listed in or the use of a plurality of combination in any.Shown embodiment with description can not be interpreted as last listing, and is used to describe exemplary characteristic of the present invention but have.
Description of drawings
In the drawings:
Fig. 1 is the sketch map of beam path of the laser beam of laser process machine of the present invention; And
Fig. 2 has shown that the laser beam shown in Fig. 1 is the intensity distribution that function is drawn with the beam radius in intermediate focus.
The specific embodiment
CO shown in Fig. 1
2 Laser process machine 1 comprises the CO with coupling output window (output coupling mirror) 3
2 Laser generator 2 is coupled output through this coupling output window laser beam 4 and enters into the light beam guidance cavity 5 through gas bleed.Focus optics 6 is integrated on the coupling output window 3, and this focus optics 6 focuses on intermediate focus ZF with laser beam 4 medially in light beam guidance cavity 5.The position of intermediate focus ZF is arbitrarily, but it is suitable for selecting a fixed range between two optical elements, and intermediate focus is between coupling output window 3 and deflecting mirror 7 in this exemplary embodiment.Laser beam 4 deflecting mirror 7 places deflection and optional laser beam 4 other element place focus on via laser Machining head 8 will be processed the workpiece (not shown) on.For example, laser process machine 1 can be laser cutting machine bed or laser weld lathe.
Water-cooled blooming piece (space diaphragm) 9 with diaphragm film perforation is positioned at intermediate focus ZF place, is used to form laser beam 4.Because show that in Fig. 2 intensity I is depicted as the function about beam radius R, diaphragm Circularhole diameter d is significantly greater than the 99% beam radius D of laser beam 4 at intermediate focus ZF place
99%Ratio d/D
99%Should between about 1.2 and about 2.5, in this exemplary embodiment, be approximately 1.4.About 99% beam diameter D for circular symmetry like 6mm
99%, diaphragm bore dia d will elect as between 7.2mm and 15.0mm.This blooming piece 9 needn't be positioned at intermediate focus ZF place accurately, in the light beam contraction section of the laser beam 4 that focuses in the middle of just being located at, but blooming piece 9 can be set at from intermediate focus ZF be the maximum place of Rayleigh length RL.For the ease of keeping and adjust the position of blooming piece 9, intermediate focus ZF and thus blooming piece 9 ideally apart from focus optics 6 about 1m to 2m.
In by the laser cutting lathe of this method configuration with oxygen (O
2) make an experiment and cause cutting edge more significantly smoothly and not to generate oxide skin as cutting gas.This cutting quality that has improved is given the credit to such fact, that is, at the processing stand place, cause the diffraction structure 10 of workpiece in the laser beam 4 of the outside of processing stand heating to be eliminated by blooming piece 9.
For the function that guarantees optimum blooming piece 9 and the little focus drifting on processing stand, coupling output window 3 uses diamond fabrication and laser Machining head 8 to be the mirror bit together with integrated focus optics 6.
The light beam guidance cavity 5 that is divided into two local chamber 5a, 5b by blooming piece 9 is rinsed gas and washes to stop particulate or gas to get into light beam guidance cavity 5 from the outside.Near local chamber 5a (flowing) flushing gas is filled entering coupling output window 3 before along arrow 6a, and before blooming piece 9, derived (flowing) once more along arrow 6b through the excess pressure valve (not shown).Likewise, flushing gas is filled into rear chamber 5b (flowing along arrow 7a) near laser Machining head 8, and after blooming piece 9, is derived (flowing along arrow 7b) once more through the excess pressure valve (not shown).These two excess pressure valves are set to same cracking pressure, like this in by the light beam guidance cavity 5 of gas bleed, in blooming piece 9 fronts or the gas pressure p of back
1, p
2For identical or roughly the same, and there is not throttle effect the flushing gas of blooming piece 9 in light beam guidance cavity 5.In addition, blooming piece 9 can further have through hole, can be balanced via the pressure between this through hole two local chamber 5a, the 5b.
Claims (11)
1. a laser process machine (1); It produces the laser beam (4) that is used for processing work at work, and this laser process machine (1) comprises focus optics (6), its focussed laser beam (4) medially in light beam guidance cavity (5); And comprise blooming piece (9); This diaphragm arrangement is used for forming laser beam (4) in intermediate focus (ZF) zone, it is characterized in that 99% beam diameter (D of diaphragm bore dia (d) and the laser beam (4) that focuses on medially
99%) about 2.5 times equally big, the maximum intensity that this 99% beam diameter is defined as the laser beam center drops to 1% beam diameter.
2. laser process machine as claimed in claim 1 is characterized in that, this laser process machine is laser cutting lathe or laser weld lathe.
3. laser process machine as claimed in claim 1 is characterized in that, intermediate focus (ZF) is positioned between the deflecting mirror of coupling output window (3) and light beam guidance cavity (5) of laser resonator (2).
4. laser process machine as claimed in claim 1 is characterized in that, intermediate focus (ZF) is positioned between first deflecting mirror (7) of coupling output window (3) and light beam guidance cavity (5) of laser resonator (2).
5. like the described laser process machine of one of claim 1 to 4, it is characterized in that blooming piece (9) is positioned and is able to the intermediate focus (ZF) that maximum Rayleigh length (RL) is left the laser beam (4) that focuses on medially.
6. like the described laser process machine of one of claim 1 to 4, it is characterized in that the focus optics (6) and/or the laser Machining head (8) of laser process machine (1) are non-transmission optics.
7. like the described laser process machine of one of claim 1 to 4; It is characterized in that the focus optics (6) of laser process machine (1) and/or the coupling output window (3) of laser resonator (2) and/or laser Machining head (8) are the transmission optics of thermal lensing effect less than the thermal lensing effect of ZnSe Optical devices.
8. like the described laser process machine of one of claim 1 to 4, it is characterized in that focus optics (6) is integrated in the coupling output window (3).
9. like the described laser process machine of one of claim 1 to 4, it is characterized in that focus optics (6) is for being positioned at the outer mirror of light beam guidance cavity (5).
10. like the described laser process machine of one of claim 1 to 4, it is characterized in that light beam guidance cavity (5) is used gas bleed.
11. laser process machine as claimed in claim 10 is characterized in that, the gas pressure (p that blooming piece (9) front and back in the light beam guidance cavity (5) of gas bleed exists
1, p
2) identical or approximate identical.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/EP2005/009498 WO2007025562A1 (en) | 2005-09-03 | 2005-09-03 | Laser machining machine with optical shutter for prevention of fringing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101257992A CN101257992A (en) | 2008-09-03 |
| CN101257992B true CN101257992B (en) | 2012-01-04 |
Family
ID=36374604
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2005800514697A Expired - Fee Related CN101257992B (en) | 2005-09-03 | 2005-09-03 | Laser processing machine tool with optical film slice for eliminating dispersion field |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US20080314880A1 (en) |
| EP (1) | EP1926568B1 (en) |
| JP (1) | JP2009506890A (en) |
| CN (1) | CN101257992B (en) |
| WO (1) | WO2007025562A1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9242309B2 (en) * | 2012-03-01 | 2016-01-26 | Foro Energy Inc. | Total internal reflection laser tools and methods |
| DE102018208752B4 (en) * | 2018-06-04 | 2024-08-22 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Device and method for machining workpieces that are difficult to access and use of a device |
| EP3815835B1 (en) * | 2019-11-04 | 2023-10-11 | Bystronic Laser AG | Laser machining head and method for laser machining a workpiece |
| CN113634880B (en) * | 2021-07-28 | 2023-12-05 | 中国科学院宁波材料技术与工程研究所 | Multi-beam water-guided laser processing device and processing system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5670069A (en) * | 1994-12-22 | 1997-09-23 | Matsushita Electric Industrial Co., Ltd. | Laser processing method |
| US6285002B1 (en) * | 1999-05-10 | 2001-09-04 | Bryan Kok Ann Ngoi | Three dimensional micro machining with a modulated ultra-short laser pulse |
| CN1311870A (en) * | 1998-07-31 | 2001-09-05 | 田纳西大学研究公司 | Apparatus and method for producing an improved laser beam |
| EP1180409A1 (en) * | 2000-08-12 | 2002-02-20 | TRUMPF LASERTECHNIK GmbH | Laser processing machine with gas cleaned beam guiding cavity |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2850764A (en) * | 1953-09-01 | 1958-09-09 | Ici Ltd | Process and apparatus for converting thermoplastic material to granular form |
| US4806724A (en) * | 1986-08-15 | 1989-02-21 | Kawasaki Steel Corp. | Laser beam machining device |
| EP0300465B1 (en) * | 1987-07-20 | 1995-10-11 | Mitsubishi Denki Kabushiki Kaisha | Laser machining apparatus |
| US5237149A (en) * | 1992-03-26 | 1993-08-17 | John Macken | Laser machining utilizing a spacial filter |
| JP2004322174A (en) * | 2003-04-25 | 2004-11-18 | Sumitomo Heavy Ind Ltd | Laser beam machining method and device |
| JP3839017B2 (en) * | 2003-11-27 | 2006-11-01 | ファナック株式会社 | Laser processing equipment |
-
2005
- 2005-09-03 CN CN2005800514697A patent/CN101257992B/en not_active Expired - Fee Related
- 2005-09-03 WO PCT/EP2005/009498 patent/WO2007025562A1/en active Application Filing
- 2005-09-03 EP EP05787622A patent/EP1926568B1/en not_active Not-in-force
- 2005-09-03 JP JP2008528348A patent/JP2009506890A/en active Pending
-
2008
- 2008-03-03 US US12/041,210 patent/US20080314880A1/en not_active Abandoned
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5670069A (en) * | 1994-12-22 | 1997-09-23 | Matsushita Electric Industrial Co., Ltd. | Laser processing method |
| CN1311870A (en) * | 1998-07-31 | 2001-09-05 | 田纳西大学研究公司 | Apparatus and method for producing an improved laser beam |
| US6285002B1 (en) * | 1999-05-10 | 2001-09-04 | Bryan Kok Ann Ngoi | Three dimensional micro machining with a modulated ultra-short laser pulse |
| EP1180409A1 (en) * | 2000-08-12 | 2002-02-20 | TRUMPF LASERTECHNIK GmbH | Laser processing machine with gas cleaned beam guiding cavity |
| US6624386B2 (en) * | 2000-08-12 | 2003-09-23 | Trumpf Lasertechnik Gmbh | Laser processing machine with gas flushed beam guiding chamber |
Also Published As
| Publication number | Publication date |
|---|---|
| US20080314880A1 (en) | 2008-12-25 |
| JP2009506890A (en) | 2009-02-19 |
| EP1926568A1 (en) | 2008-06-04 |
| CN101257992A (en) | 2008-09-03 |
| EP1926568B1 (en) | 2012-11-14 |
| WO2007025562A1 (en) | 2007-03-08 |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120104 |